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	Acknowledgements
	Many thanks to:
	Tom Ace
	Sheldon Brown
	David Chase
	Bruce Dance
	Harriet Fell
	Jim Gill
	Tony Hadland
	Jens Hansen
	John Harris
	Torben Finn Laursen
	Crispin Miller
	David Moorehouse
	Adam Rankin
	Konstantin Shemyak
	Shimano
	SRAM
	Sturmey-Archer and the Sturmey-Archer Heritage Web site
	Howard Sutherland
	A footnote to the header cell of each page of calculations gives the source of information.
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